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Discussion Forums - The Hendrix Group
HomeHomeDiscussionsDiscussionsMaterial Select...Material Select...303 SS Toggle Shafts Breaking303 SS Toggle Shafts Breaking
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6/25/2003 9:00 AM
 
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We are a switch manufacturer, and so not metals experts. We have been experiencing failures of switch toggle shafts. The shafts are 303 SS and are approximately .125" at the point where they are failing. They are failing during test where they are actuated with 2 pneumatic cylinders that actuate the toggle from side to side at approximately 5 pounds of force. After 3000 to 18,000 cycles, some shafts will fail. They are rated for 40,000 cycles. We believe we are dealing with a fatigue failure, but don't know for sure. I have pictures of the failures that I could forward to anyone who could lend an opinion. My email address is wayne.smith@ottoeng.com. Thank you in advance.
 
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10/23/2003 9:00 AM
 
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you should use a spring loaded coupling between the switch and actuator, to limit the force and to allow some degree of flexibility in case the actuator positioning changes.
 
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